Income Taxes (Deferred Tax Liabilities and Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax liabilities:
Depreciation	$ (102,726)	$ (77,415)
Deferred profit (for tax purposes) on sale to finance subsidiary	(41,951)	(60,340)
Lease revenue and related depreciation	(166,544)	(133,908)
Intangible assets	(98,707)	(106,488)
Other	(33,353)	(22,468)
Gross deferred tax liabilities	(443,281)	(400,619)
Deferred tax assets:
Nonpension postretirement benefits	42,422	48,387
Pension	60,063	66,270
Inventory and equipment capitalization	7,216	11,380
Restructuring charges	5,064	12,476
Long-term incentives	11,517	11,544
Net operating loss	106,029	108,006
Tax credit carry forwards	64,148	82,285
Tax uncertainties gross-up	6,692	9,920
Other	46,885	36,936
Gross deferred tax assets	350,036	387,204
Less: Valuation allowance	(142,496)	(178,156)
Net deferred tax assets	207,540	209,048
Total deferred taxes, net	$ (235,741)	$ (191,571)

The sum of the tax effects as of the balance sheet date of the amount of excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset and the tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

No definition available.